Punch



M. D. KNOWLTON.

v PUNCH. No. 384,532. Patented June 12, 1888.

@KM/4. L M075; "L gw@ UNITED STATES PATENT EEicE.

MARK D. KNOWLTON, OF CHICAGO, ILLINOIS.

PUNCH.

SPECIFICATION forming part of Letters Patent No. 384,532, dated `Tune12, 1888.

Application filed August 19,1887. serial No. 247,340. (No model.)

To aZZ whom it may concern.-

Beit knownthat I, MARK D. KNowLToN, of Chicago, in the county of Cookand State of Illinois, have invented certain new and useful Improvementsin Punches; and I do hereby declare that the following is a full, clear,and exact description thereof, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon, which form apart of this specilication.

This invention relates to a novel construction in punches of that kindused for cutting objects of various shapes from sheets or plates ofpaper, straw-board, metal, or other material.

The invention consists in the matters hereinafter described, and pointedout in the appended claims.

A punch embodying my invention embraces, in addition to the projectingpart carrying the cutting-edge by which the object to be formed issevered about its margins from the plate or sheet, an auxiliary cutterextending outwardly from the main cutting-edge of the punch and actingto sever the material of the sheet or plate across the part between theline at which the sheet is cut by the punch and the aperture left by theremoval of the piece previously cut out. The auxiliary cutter thusserves to trim the edge of the sheet as the cutting progresses, so as toleave the sheet with an even or uniform edge and in convenient form forhandling.

In the accompanying drawings, Figure l is a perspective view of a punchembodying my invention. Fig. 2 is a face view of the same. Fig. 3 is aside elevation of thesame, showing the flat face of the auxiliarycutter. Fig. 4 is a side elevation of the same, showing the auxiliarycutter in end view. Fig. 5 is a detail view of an adjustable clampplateemployed for holding the auxiliary cutter in place. Fig. 6 is a view ofa sheet from which a series of disks have been out by the punch shown inFigs. 1, 2, 3, 4, and 5, illustrating the action of the auxiliarycutter.

In the drawings, Figs. I to 5, A indicates as a whole a frame or holderadapted for attachment to a press or other actuating device andconstructed to receive and hold a punch 'of any size or shape Bindicates a solid punch of cylindric shape, which is attached to theholder A by means of a cylindric shank on the punch entering an axialrecess in the holder and secured therein by means of a set-screw, B3.

C is an auxiliary cutter, which is provided with an acute or chiseledge, and is arranged with one of its ends in contact with the side ofthe punch. Said cutter in the particular embodiment of my inventionherein shown is held in operative position with relation to the punch bya clamping or holding device so arranged that the said auxiliary cuttermay be moved or shifted in. position both laterally and endwise, tocorrespond with the form or size of punch which is secured in the saidholder.

The holder A herein illustrated is provided with a cyliudric shank, A',having` an enlarged Hat part or plate, A2,. against which the punch Bdirectly rests or bears. Devices are provided in the particular holdershown for adjustably supporting the cutter C, as follows: The cutter inthis instance consists of a flat plate beveled at one side to form anacute cutting-edge. A2 of the holder is formed a recess, A3, withinwhich are located two clampplates, D D, arranged to bear againstopposite sides of the cutter C. The said plates are held in contact withthe cutter by means of opposing setscrews E E, inserted through oppositesides of the plate A2, and extending into the recess Aa in such manneras to sustain the clamp-plates in a desired position therein. As hereinshown, four set-screws E E are used for holding the clampplates inplace; but a greater or less number may be used in practice, as desired.The recess A.3 and clamp-plates D D extend inwardly to a point adjacentto the shank of the punch, thereby enabling the aux iliary cutter to besecured in place with its end in contact with a punch of the smallestsize adapted to be placed in the holder.

By backing out or advancing the set-screws E E the clamp-plates andcutter may be shifted laterally to bring the cutting-edge in a desiredposition relatively to the cutting-edge of the punch, according to thewidth of the waste strip which it is desired to cut from the margin ofthe sheet.

In the lower surface of the plate' l IOO The cutting-edge of theauxiliary cutter C is set back from the lower face of the punch suchdistance that when the punch is advanced into the opposing matrix thefull extent of its throw the edge ofthe critter will come in contact ornearly in contact with the upper face of the matrix, thereby acting withdirect pressure to cut or sever the sheet in its part adjacent to thepunch. Even if the cutter does not come in actual contact with thematrix the sheet will usually be cut sufficiently to be easilyseparated, and the general result desired thus attained. In the case ofmaterial like thick straw-board, for instance, the oblique edge of thecutter will force or break away the stock along the cut, so as to com'pletely sever the same when the cutter passes only part way through thesheet.

B', Figs. 3 and 4, indicates the matrix, and B2 a sheet laid over thesame beneath the punch. In Fig. 3 the punch is shown as free from thematrix; but in Fig. Ll it is shown as advanced into the matrix asuiiieient distance to carry the edge of the cutter C through the sheetresting upon said matrix.

In the use of a punch provided with an auxiliary cutter arranged asabove described the sheet is fed to the punch with its edgeapproximately parallel with the cutter, and is advanced to the cutter insuch direction that the auxiliary cutter extends forwardly from thepunch, (referring to the direction of motion of the sheet,) and islocated at the side of the cutter nearest the body or uncut portion ofthe sheet, so that the parts of the sheet left between the cuis arecontinually severed from the main part of the sheet as the cuttingprogresses.

The operation of the auxiliary cutter in the manner set forth may bemore readily understood by reference to Fig. 6, which shows the marginalpart of a sheet from whichanumber of disks have been cut by a. punchlike that shown in Figs. l to 5. H, in said Fig. 6, is the sheet, h 71are a series of holes left by the removal of the disks, and the lines hh. indicate the cuts made bythe auxiliary cutter. In cutting circulardisks the surplus material along one line of holes will not be entirelysevered until the cuts have been made throughout the full length of thesheet, and in said Fig. 6 if lf indicate the lines of the cuts made bythe auxiliary cutter in punching out a previous line of holes, while Hindicates as a whole the strip of surplus material which will be severedfrom the sheet after the holes h h have been formed throughout the fullwidth of the sheet.

The employment of an auxiliary cutter acting to trim the edge ofthesheet as fast as objects are cut therefrom by a punch is of especialutility in the case of a punching-machine embracing a guide or gage fordetermining the position of the edge of the sheet with relation to thepunch, and alsoin machines having automatic feed devices for the sheets,for the reason that the severing of the projecting surplus parts of thesheets leaves a straight edge or a series of projecting parts after eachrow of cuts, whereby the sheet may be placed or held against the guidein a hand-feeding machine or the guides of the feed devices in anautomatic machine, and the position of the sheet thereby accuratelydetermined.

The employment of the auxiliary cutter, severing the waste as the holesare formed, furthermore enables a gage acting against the newly-cut edgeto be used in addition to the back gage, or that at the rear of thepunch, heretofore employed. The use of such second gage greatlyfacilitates the handling ofthe stock by affording a guide to the advanceend of the sheet at the time the latter is so far advanced as to havebut little bearing upon the back gage. Heretofore in the use of apunching-machine having a back gage to guide the stock, as well as inautomatically-feeding machines, it has been colnmon to eut the stockinto narrow strips somewhat wider than the articles to be formed, inorder to afford suitable guiding-ed ges by which each row of holes maybe made. In the use of a punch made with an auxiliary cutter such as isherein shown, however, such cutting into strips is not required, wherebythe holes may be made closer to each other, with a large saving of wasteand a corresponding economy in the use ofthe stock, and the labor ofcutting the stock into strips is avoided.

It will of course be understood that the aux iliary cutter, arranged andoperating in the manner described, may be employed in connection withpunches of any shape, and when said punches have a cutting-edge ofeither regular or irregular form.

The main feature of novelty in my invention embraces a punch and matrixor similar cutting device provided with an auxiliary cutter arranged toact against an opposing surface of the matrix to sever the blank sheetor plate in the part of the latter adjacent to the cutter in such manneras to cut or slit the said sheet or plate outwardly from thc openingmade therein by the punch-as, for instance, the appended first claimcovers the auxiliary critter when made either integral with or separatefrom the punch proper, or when either immovably or adjustably connectedwith the punch or its support. Such auxiliary cutter, furthermore, mayobviously be arranged at any desired angle with relation to the punch.

The particular construction shown in Figs. l to 5, embracing means foradjustably supporting the cutter, forms a separate improvement, which isherein specifically claimed as part of my invention.

I claim as my inventionl. The combination, with a punch and a die ormatrix, of an auxiliary cutter extending outwardly from thepuncln saidauxiliary cutter having its cutting-edge set back from the cutting-edgeofthe punch and arranged to act against an opposing fiat surface of thedie or matrix, substantially as described.

ICO

2. The combination, with a punch and a die or matrix, of an auxiliarycutter attached to and extending outwardly fromthe punch, thecutting-edge of said auxiliary cutter being set back from thecuttingedge of the punch and arranged to act against an, opposing datsurface of the matrix, and means adjustably connecting said cutter withthe punch, whereby the edge of the cutter may be adj usted with relationto the opposing face of the matrix, substantially as described.

3. The combination, with a punch and a die or matrix, of an auxiliarycutter extending outwardly from the cutting-edge of the punch and'arranged to act against an opposing flat surface of the matrix, and aholder for the said punch and auxiliary cutter, said cutter beingadjustably sustained in the holder by means affording both an endwiseand lateral adjustment of the cutter, substantially as described.

4. The combination,with a punch, of aholder for the same provided with ashank for attachment to a punching-machine, and with a plate supportingthe punch and provided with a recess in its lower face, an auxiliarycutter, movable clampplates located within the said recess, and opposingset screws inserted through said plate and bearing against theclamp-plates, substantially as described.

In testimony that I claim the foregoing as my invention I affix mysignature in presence of two witnesses.

MARK D. KNOWLTON.

W'itnesses:

.0. CLARENCE POOLE,

O. N. WILLIs.

